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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9b79d0f3e64cef7d2d35a0050f7be8bc21eeae6e4f0254dd09a27674925a76' 
  AND token = 'J/A52yQ+ucvfn5qUm5sOSFXtLtgvpFR3cziMxINOqVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}